Assessment of myocardial function in neonates using tissue Doppler imaging.

Area of Science:

• Neonatal cardiology
• Pediatric echocardiography
• Cardiac physiology

Background:

• Assessing neonatal cardiac function is crucial for early diagnosis and management.
• Standard echocardiography provides valuable hemodynamic data, but myocardial tissue velocities offer further insight.

Purpose of the Study:

• To evaluate the feasibility and findings of tissue Doppler imaging (TDI) for measuring left and right ventricular myocardial velocities in neonates within the first 24 hours of life.
• To assess the relationship between gestational age and myocardial velocities (S', E', A') and the E/E' ratio.

Main Methods:

• Prospective study involving 43 neonates categorized by gestational age: term, preterm (30-36 weeks), and very preterm (<30 weeks).
• Tissue Doppler imaging (TDI) was used to measure peak systolic (S'), early diastolic (E'), and late diastolic (A') myocardial velocities.
• Standard echocardiography was performed concurrently, and the E/E' ratio was calculated for both ventricles.

Main Results:

• Myocardial velocities demonstrated a positive correlation with increasing gestational age.
• Right ventricular myocardial velocities were significantly higher than left ventricular velocities.
• The E/E' ratio decreased with increasing gestational age, with higher left E/E' ratios observed across all groups.

Conclusions:

• Tissue Doppler imaging (TDI) is a feasible technique for assessing myocardial velocities in preterm neonates.
• Increasing gestational age is associated with enhanced myocardial velocities and improved diastolic function (lower E/E' ratio).
• TDI provides valuable supplementary information on neonatal cardiac function when used with standard echocardiography.